Integrating meter



Jan. 12 1926.

E- H- FREEMAN INTEGRATING METER);

Filed April 15. 1920 UNITED' STATES PATENT OFFICE.

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Application fled April 15, mo. s men. were.

The invention is exemplified in the combination and arrangement of arts shown in the accompanying drawing aiid described in the following specification, and it is more particularly pointed out in the appended claims.

In the drawing the figure is a diagrammatic we view of one embodiment of the invention.

In general a meter constructed in accordance with the present invention comprises a rotatable element in which two or more torques are developed, one-or more producmg rotation, andfone or more retardingrotation.

Thqe torques are produce and the number of,revo-- "we no 1403.- lutions' o? the rotatable element is an gration withm w to time of some function of the H ctancesor of the admit-, tances ofth'eelectrical circuits in which the'" meter is ellmeeted. Since the conductance or the' ocf an electric circuit is the reciprocal of the resistance or impedance respectively of the it will be under-v inw' n'uaemdzangl thecurrent through'the druit emnectedwith the magnetillLLflneem-rmtflxroughthecircuitof .V, are constant,- or-tha't eq'ua1 tolone another, the equationof the 'coils,andarotorarrangedtomove the magnet26,'and Q-the phase difierence between I and 1,. If V and Y are voltage and adm ttancerespectively inthe circu1t of the m at 25 and V and wY the voltage and 'ttance of the circuit of the magnet 26, then 1= 1 1 3) and Therefore l= 1e z 1 s sin 8 The retarding torque T is produced b friction and b motion of the disc throug the fields of t e electro-magnets. If ractically all of the retarding to e is eveloped from theelectro-magnet then r rfl' al a in" which K is a constant, en the angular velocity, Y, the'admittance in the circuit of the magnet 27 and V the vol in the circuit of the magnet By the twotorquesand a that V V, and V, andV, are

meter becomes If sin 6 is constant, it is apparent from the abovexequation that it is possible to obtain inte atlons of the admittance of any one of t e magnet circuits, if the other two remain constant. p

Errors due to friction have been ne lected but these can be more or less compl y corrected by that the meters are provided with any usual form of counter for 11 the number of revolutions in a per1od of counter'is shown at 28 in Fig. 1 of the I claim:

1. A meter of the induction motor type comprising a plurality of sleaze-magnets all of, which are provi ed with cores having :flflicient cross-sectional area for;

eir ength to permit operation thereo less than magnetic saturatim during normal fluctuations of the current in the specialcircuits. Itisunderstood time. Such -a the fields of said electro-ma nets, the windings of said electro-magnetsbeing connected in multiple to a common source of alternating electro-motive force so as to energize said magnets to produce both driving and retarding torques on said rotor, the circuit of one of said magnets being variable to change the admittance thereof thus varying the speed of said rotor and causing said meter to in ate a function of said circuit substantially mdependently of variations in vol of said source.

2. meter of the induction motor type having a conductor disc rotor, a plurality of magnetshaving their poles disposed on opposite sides of said dlsc at different positions thereon all of said magnets having cores of suflicient cross-sectional area throughout their length to permit operation thereof at less'than magnetic saturation during normal fluctuations of the current in the respective coils, one of said magnets being constructed and wound to roduce a relatively strong magnetic fiel so as to exert a predominating retarding torque on said disc, the winding circuits of said magnets being connected in multiple to a common source of electromotive force, and means for the admittance of the circuit of one va 80 of magnets to vary the speed of said meter so that said meter integrates a function of said circuit.

3. An integrating meter comprising a rotary member, electro-magnetic means for imparting an accelerating torque to said member, electro-magnetic means for exerting a retarding torque on said member, all of said electro-magnetic means having the cores thereof of suflicient cross-sectional area throughout their lengths to permit operation thereof at a flux density less than saturation for normal current values for said meter, the electric circuit of one of said electro-magnetic means having a eable admittance for changing the of rotation of said rotary member, an means for impressing the same electro-motive force on the electric circuits of all of said electromagnetic means so that variations in said accelerating and retarding torques due to fluctuations in said electro-motive force will substantially counteract one another, said instrument bein calibrated to integrate admittance of sai changeable electric circuit directly.

In testimony whereof I have signed my name'to this specification on this 13th day of April,'A. D. 1920.

ERNEST HQFBEEHAN. 

